These one of a kind adapters allow you to turn any 12, 16, or 20 GA. Shotgun in to a Rifle instantly! All you have to do is insert the "DINA ADAPTER" into the shotgun's chamber, like you would do with a standard shell. If your shotgun has a magazine it can be filled to capacity. DINA ADAPTERS are an inexpensive way to get more use out of your gun! The adapters are also made out of high tolerance machined metal converter with rifling for accuracy.